package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.springframework.aop.framework.AopContext;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service

public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;
    @Resource
    private RedisIdWorker redisIdWorker;
    @Override
    public Result seckillVoucher(Long voucherId) {
        //1.查询秒杀券
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        //2.判断秒杀券是否在售
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            //没开始
            return Result.fail("秒杀券尚未开始");
        }
        //4.判断库存是否充足
        if (voucher.getStock() < 1) {
            return Result.fail("库存不足");
        }

        Long userId = UserHolder.getUser().getId();
        synchronized (userId.toString().intern()) {
            //获取代理对象(事务)
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        }
    }

    @Transactional
    @Override
    public  Result createVoucherOrder(Long voucherId) {
        //5一人一单
        Long userId = UserHolder.getUser().getId();

            //5.1 查询订单
            int count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
            //5.2 判断是否存在
            if (count > 0) {
                return Result.fail("用户已经购买过一次了！");
            }
            //6.扣减库存
            boolean succsee = seckillVoucherService.update()
                    .setSql("stock=stock-1")// set stock = stocl -1
                    .eq("voucher_id", voucherId)
                    .gt("stock", 0) // where id = ? and stock > 0
                    .update();
            if (!succsee) {
                return Result.fail("库存不足");
            }

            //6.创建订单
            VoucherOrder voucherOrder = new VoucherOrder();
            // 订单id
            Long orderId = redisIdWorker.next("order");
            voucherOrder.setId(orderId);
            // 用户id
            voucherOrder.setUserId(userId);
            // 代金券id
            voucherOrder.setVoucherId(voucherId);
            save(voucherOrder);

            //返回订单id
            return Result.ok(orderId);
        }
    }

